package io.github.pigmesh.ai.deepseek.core.chat;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.PropertyNamingStrategies;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonNaming;
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;

import java.util.Objects;

import static io.github.pigmesh.ai.deepseek.core.chat.ToolType.FUNCTION;

@JsonDeserialize(builder = ToolChoice.Builder.class)
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
public class ToolChoice {

	@JsonProperty
	private final ToolType type = FUNCTION;

	@JsonProperty
	private final Function function;

	private ToolChoice(Builder builder) {
		function = builder.function;
	}

	@Override
	public boolean equals(Object another) {
		if (this == another)
			return true;
		return another instanceof ToolChoice && equalTo((ToolChoice) another);
	}

	private boolean equalTo(ToolChoice another) {
		return Objects.equals(type, another.type) && Objects.equals(function, another.function);
	}

	@Override
	public int hashCode() {
		int h = 5381;
		h += (h << 5) + Objects.hashCode(type);
		h += (h << 5) + Objects.hashCode(function);
		return h;
	}

	@Override
	public String toString() {
		return "ToolChoice{" + "type=" + type + ", function=" + function + "}";
	}

	public static ToolChoice from(String functionName) {
		return new Builder().function(Function.builder().name(functionName).build()).build();
	}

	@JsonPOJOBuilder(withPrefix = "")
	@JsonIgnoreProperties(ignoreUnknown = true)
	@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
	public static final class Builder {

		private Function function;

		private Builder() {
		}

		public ToolChoice.Builder function(Function function) {
			this.function = function;
			return this;
		}

		public ToolChoice build() {
			return new ToolChoice(this);
		}

	}

}
